Hives, also known as urticaria, are circumscribed swellings on the skin that usually are itchy... Often they're pink or red, but they don't have to be. Hives happen when the cells in the.. skin called mast cells release amine.

Skin conditions that may be triggered by allergic reaction and that they may be very uncomfortable,.. inflicting an excellent deal of distress and even embarrassment. Angioedema is swelling within the.. deep layers of the skin.